ceph-csi/internal/liveness/liveness.go
Rakshith R 43f753760b cleanup: resolve nlreturn linter issues
nlreturn linter requires a new line before return
and branch statements except when the return is alone
inside a statement group (such as an if statement) to
increase code clarity. This commit addresses such issues.

Updates: #1586

Signed-off-by: Rakshith R <rar@redhat.com>
2021-07-22 06:05:01 +00:00

94 lines
2.5 KiB
Go

/*
Copyright 2019 The Ceph-CSI Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package liveness
import (
"context"
"time"
"github.com/ceph/ceph-csi/internal/util"
connlib "github.com/kubernetes-csi/csi-lib-utils/connection"
"github.com/kubernetes-csi/csi-lib-utils/metrics"
"github.com/kubernetes-csi/csi-lib-utils/rpc"
"github.com/prometheus/client_golang/prometheus"
"google.golang.org/grpc"
)
var liveness = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "csi",
Name: "liveness",
Help: "Liveness Probe",
})
func getLiveness(timeout time.Duration, csiConn *grpc.ClientConn) {
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
util.TraceLogMsg("Sending probe request to CSI driver")
ready, err := rpc.Probe(ctx, csiConn)
if err != nil {
liveness.Set(0)
util.ErrorLogMsg("health check failed: %v", err)
return
}
if !ready {
liveness.Set(0)
util.ErrorLogMsg("driver responded but is not ready")
return
}
liveness.Set(1)
util.ExtendedLogMsg("Health check succeeded")
}
func recordLiveness(endpoint, drivername string, pollTime, timeout time.Duration) {
liveMetricsManager := metrics.NewCSIMetricsManager(drivername)
// register prometheus metrics
err := prometheus.Register(liveness)
if err != nil {
util.FatalLogMsg(err.Error())
}
csiConn, err := connlib.Connect(endpoint, liveMetricsManager)
if err != nil {
// connlib should retry forever so a returned error should mean
// the grpc client is misconfigured rather than an error on the network
util.FatalLogMsg("failed to establish connection to CSI driver: %v", err)
}
// get liveness periodically
ticker := time.NewTicker(pollTime)
defer ticker.Stop()
for range ticker.C {
getLiveness(timeout, csiConn)
}
}
// Run starts liveness collection and prometheus endpoint.
func Run(conf *util.Config) {
util.ExtendedLogMsg("Liveness Running")
// start liveness collection
go recordLiveness(conf.Endpoint, conf.DriverName, conf.PollTime, conf.PoolTimeout)
// start up prometheus endpoint
util.StartMetricsServer(conf)
}